A histopathologic skin biopsy evaluated by light microscopy following routine hematoxylin and eosin (H&E) staining. The specimen is an excisional biopsy of cutaneous tissue. The image shows malignant melanocytic proliferation with invasion through the epidermal-dermal junction into the dermis. Tumor nests and single-cell invasion are evident at the dermoepidermal junction with dermal penetration by pigmented melanocytes. Breslow thickness, the most important prognostic parameter in melanoma, is measured from the most superficial granular cell layer of the epidermis to the deepest point of tumor invasion; in this case the depth is 1.0 millimeter. If an ulceration is present, depth is measured from the base of the ulcer; ulceration is not described here. Some tumors may extend along adnexal structures, and if present this finding is documented as part of depth assessment. Polypoid tumor components, if any, are measured through their thickest region. Although invasion depth is continuous, AJCC guidelines categorize 1 mm, 2 mm, and 4 mm for staging (T1, T2, T3). Clinically, Breslow depth informs prognosis, sentinel lymph node biopsy decisions, and surgical margins for wide local excision, as well as consideration for adjuvant therapy depending on ulceration, mitotic rate, and nodal status.

Imaging modality: Intraoperative surgical photography of a sentinel lymph node biopsy for malignant melanoma. Technique: blue dye mapping using Lymphazurin blue (isosulfan blue) injected near the primary lesion to trace afferent lymphatics to the sentinel node, which is visually stained a blue-green hue. Anatomical context: axillary regional lymphatics draining the tumor bed are highlighted by dye transport, with the sentinel lymph node identified by conspicuous color uptake. Visual features: a single lymph node is enlarged and engorged, with surrounding adipose tissue and operating field in clear view; the node exhibits uniform blue coloration within the cortex and hilum, with surrounding soft tissues appearing erythematous from operative exposure. Notable findings: blue-stained sentinel node ready for targeted excision; no gross metastatic nodal disease is discernible on this view, though microscopic metastasis may be present. Clinical significance: sentinel lymph node biopsy is a standard staging procedure in melanoma, enabling nodal assessment while minimizing extensive lymphadenectomy. Differential considerations: accidental intradermal staining, dye leakage, or allergic reaction to isosulfan blue. Clinical correlation: histopathologic examination of the excised node is required to determine nodal metastasis status, guiding adjuvant therapy and prognosis. This image serves educational and surgical planning purposes for clinicians, trainees, and researchers studying lymphatic mapping in cutaneous melanoma.

Clinical photography of a solitary scalp lesion prior to wide local excision. Modality: clinical photography with high‑resolution digital color imaging. Anatomical location: scalp skin over the cranial vault; exact laterality not specified. Imaging perspective: frontal/occlusal view bias, close-up of the lesion. The lesion appears as a raised, dome‑shaped to indurated nodule with an erythematous to pink surface, focal crusting, and a central necrotic/ulcerated area. Surrounding perilesional erythema and mild edema are evident; there may be subtle superficial induration at the lesion margins. The circumscribed lesion is outlined in purple ink to aid surgical planning. This morphology raises concern for a high‑grade cutaneous neoplasm, most consistent with pleomorphic dermal sarcoma (cutaneous undifferentiated pleomorphic sarcoma, UPS), a malignant dermal/subcutaneous spindle cell tumor. Differential diagnoses include basal cell carcinoma, squamous cell carcinoma, amelanotic melanoma, keratoacanthoma, spindle cell carcinoma, and other cutaneous sarcomas. The image provides essential preoperative context to guide biopsy strategy, margin planning, and definitive wide excision. Diagnostic significance lies in distinguishing aggressive skin cancers from benign mimics, informing staging, sentinel lymph node assessment considerations, and adjuvant therapy decisions when histology confirms UPS. This preoperative image supports risk stratification and informs multidisciplinary discussion with dermatopathology and surgical oncology.

In this dermoscopy examination, a solitary cutaneous lesion is imaged in vivo with dermoscopic close-up (polarized light, approximately 10x magnification). The lesion presents as pink to light red, showing atypical vascular patterns and peripheral speckles of pigment. Morphology is asymmetric with irregular, poorly defined borders, and a raised, enface appearance typical of an active melanocytic neoplasm. The primary diagnosis is malignant melanoma; Breslow thickness is reported as 8.3 mm (thick melanoma), compatible with substantial risk of subcutaneous invasion and metastatic potential. Dermoscopic features include irregular, dilated vessels and subtle pigment peppering at the lesion periphery, which correlate with invasive growth and angiogenesis. Differential considerations include pigmented nevi with vascular irregularity, Spitz nevi, blue nevus, or amelanotic melanoma; however, the combination of pink coloration, atypical vasculature, and peripheral pigment supports melanoma in this context. Clinically, these findings are relevant for diagnostic decision-making, prognostication, and treatment planning. Potential clinical applications encompass education for dermoscopy interpretation, imaging-based risk stratification, and guiding biopsy/surgical planning. Management implications include wide local excision with margins defined by thickness and consideration of sentinel lymph node biopsy, lymphatic assessment, and comprehensive staging per guidelines. This image demonstrates high-risk melanoma characteristics suitable for educational and research datasets. Resources.